Remove all the blocks to make the composite number going out but keep the prime number. Click or tap the unused block to drop the composite numbers.
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Outer
Red C
Geome
Angry
Quiz:
Fail
Adven
Bts B
Buddy
Flipz
Subwa
Garfi
Shell
Chick
Knife
Among
2248
My Sw
Lumbe
Gothi
Angry
Merge
Slime
Grass
Alien
Mizu
Tic T
Cool
Class
Clash
Hallo
Fire
Good